Measurement of the production of charm jets tagged with D0 mesons in pp collisions at $$ \sqrt{\mathrm{s}}=7 $$ TeV
抄録
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The production of charm jets in proton-proton collisions at a center-of-mass energy of <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s}=7 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>7</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV was measured with the ALICE detector at the CERN Large Hadron Collider. The measurement is based on a data sample corresponding to a total integrated luminosity of 6<jats:italic>.</jats:italic>23 nb<jats:sup>−1</jats:sup>, collected using a minimum-bias trigger. Charm jets are identified by the presence of a D<jats:sup>0</jats:sup> meson among their constituents. The D<jats:sup>0</jats:sup> mesons are reconstructed from their hadronic decay D<jats:sup>0</jats:sup> →K<jats:sup>−</jats:sup>π<jats:sup>+</jats:sup>. The D<jats:sup>0</jats:sup>-meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-<jats:italic>k</jats:italic> <jats:sub>T</jats:sub> algorithm in the jet transverse momentum range <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ 5<{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>5</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mo>,</mml:mo> <mml:mi>jet</mml:mi> </mml:mrow> </mml:msub> <mml:mi>ch</mml:mi> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> <jats:italic><</jats:italic> 30 GeV<jats:italic>/c</jats:italic> and pseudorapidity |<jats:italic>η</jats:italic> <jats:sub>jet</jats:sub>| <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>5. The fraction of charged jets containing a D<jats:sup>0</jats:sup>-meson increases with <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>p</mml:mi> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mo>,</mml:mo> <mml:mi>jet</mml:mi> </mml:mrow> </mml:msub> <mml:mi>ch</mml:mi> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> from 0<jats:italic>.</jats:italic>042 ± 0<jats:italic>.</jats:italic>004 (stat) ± 0<jats:italic>.</jats:italic>006 (syst) to 0<jats:italic>.</jats:italic>080 ± 0<jats:italic>.</jats:italic>009 (stat) ± 0<jats:italic>.</jats:italic>008 (syst). The distribution of D<jats:sup>0</jats:sup>-meson tagged jets as a function of the jet momentum fraction carried by the D<jats:sup>0</jats:sup> meson in the direction of the jet axis <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \left({z}_{\parallel}^{\mathrm{ch}}\right) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfenced> <mml:msubsup> <mml:mi>z</mml:mi> <mml:mo>∥</mml:mo> <mml:mi>ch</mml:mi> </mml:msubsup> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> is reported for two ranges of jet transverse momenta, <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ 5<{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>5</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mo>,</mml:mo> <mml:mi>jet</mml:mi> </mml:mrow> </mml:msub> <mml:mi>ch</mml:mi> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> <jats:italic><</jats:italic> 15 GeV<jats:italic>/c</jats:italic> and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ 15<{p}_{{\mathrm{T}}_{,\mathrm{jet}}}^{\mathrm{ch}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>15</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mo>,</mml:mo> <mml:mi>jet</mml:mi> </mml:mrow> </mml:msub> <mml:mi>ch</mml:mi> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> <jats:italic><</jats:italic> 30 GeV<jats:italic>/c</jats:italic> in the intervals <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ 0.2<{z}_{\Big\Vert}^{\mathrm{ch}}<1.0 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>0.2</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>z</mml:mi> <mml:mo>‖</mml:mo> <mml:mi>ch</mml:mi> </mml:msubsup> <mml:mo><</mml:mo> <mml:mn>1.0</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ 0.4<{z}_{\Big\Vert}^{\mathrm{ch}}<1.0 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>0.4</mml:mn> <mml:mo><</mml:mo> <mml:msubsup> <mml:mi>z</mml:mi> <mml:mo>‖</mml:mo> <mml:mi>ch</mml:mi> </mml:msubsup> <mml:mo><</mml:mo> <mml:mn>1.0</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula>, respectively. The data are compared with results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and with a Next-to-Leading-Order perturbative Quantum Chromodynamics calculation, obtained with the POWHEG method and interfaced with PYTHIA 6 for the generation of the parton shower, fragmentation, hadronisation and underlying event.</jats:p>
収録刊行物
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- Journal of High Energy Physics
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Journal of High Energy Physics 2019 (8), 2019-08
Springer Science and Business Media LLC